loop-unroll: teach remapInstruction to update dbg.value intrinsics.

Fixes PR35112.

https://bugs.llvm.org/show_bug.cgi?id=35112

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317138 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 368924ad91dfdd49a4b28251b47f9e723241ba92)
2 files changed